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TES: The largest network of teachers in the world
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Table of Contents
Does temperature affect Rebound?
An experiment can be designed to measure rebound height using
'bouncy balls' of different temperatures.
Broad Question:
How does temperature affect the rebound height of a ball?
Specific Question:
Will there be a difference in the rebound capacity if one ball is frozen,
one is cooled, and one is room temperature?
Hypothesis:
The room temperature ball will bounce higher (rebound height) than the others.
Graph of Hypothesis:
Variables:
Independent Variable:
The balls are all the same size and mass; the balls are dropped from the
Same height (400cm); the same measuring tool will be used for each trial.The frozen ball will be put back into the freezer after each trial.The refrigerated ball will be put back into
the refrigerator after each trial. The room temperature ball will be returned to the room (B-37).
The balls were each massed. The average mass was 25.30g.
Frozen (#1= 24.1g), cooled( #2 =26.2g,),
room temperature( #3=25.8g)
The circumference of each ball was 23.5cm.
Dependent Variable:
Different rebound heights for each ball, 6 trials for each ball of different temperature.
Variables That Need To Be Controlled:
Temperature of the balls; one will be put in the
freezer 5 days; one will be refrigerated for 5 days;1 ball will be left at room temperature for 5 days.
Vocabulary List That Needs Explanation:
Rebound: The height of the bounce of a ball
General Plan:
Potential Problems And Solutions:The frozen ball may shatter on impact.
Safety Or Environmental Concerns: Clear the area when performing the experiment.Experimental Design:
Controlled, manipulated experiment
What is your experimental unit?
Measurements will be taken of the rebound height of 3 balls; one frozen for 3 days; one refrigerated for 3 days;one kept at room temperature for 3 days.
Number Of Trials:
Each ball will be tested 6 times (6 trials).Number Of Subjects In Each trial:
There will be one ball for each set of 6 trials; each set will use a ball of different temperature.Number of Observations:
There will be 18 observations and recordingf data.When data will be collected
Data will be collected during the second week of February, 2013.Where will data be collected?
The data will be collected outside the science room .Help · About · Blog · Pricing · Privacy · Terms · **Support** · **Upgrade**
Contributions to http://mwvsciencefair.wikispaces.com/ are licensed under a Creative Commons Attribution 3.0 License.
Resources and Budget Table:
Detailed Procedure:
Part One:1. Purchase 3 'bouncy balls'.
2. Place one ball in the refrigerator freezer compartment.
3. Place one ball in the refrigerator.
4. Place one ball in a safe place in the classroom.
5. Leave the balls in place for one week.
Part Two:
1. Tape the tape measure to the wall, attaching it to the level of the rail. A measurement will be taken of wall height, from the top
of the rail to the floor. Pieces of tape will be attached to the wall at regular intervals.
2. Assistant will stand on ground floor with camera and data chart.
3. Standing on the top floor, scientist will hold one of the balls in hand, straight out before him.
4. For each trial, scientist will let go of the ball.
5. Assistant will quickly note the rebound height measurement, and document it.
6. Use the data to create a graph showing the results of the experiment.
Photo List
Time Line
The trials were performed over a two week period.Data Table:
GRAPH OF RESULTS
Data Analysis:
The balls were dropped at the same height: 400cm. There were 6 trials for each ball.The frozen ball and the refrigerated ball were in the refrigerator/freezer for 10 days.
Results:
The graph shows that the frozen ball's average rebound height is 77cm.
The average rebound height for the cooled ball is 134cm.
The average for the room temperature ball is 149cm.
The experiment shows that temperature does affect the rebound height of the balls used.
Results: Freezing the ball results in less rebound height. The highest rebound occurred with the room- temperature ball.
Photos
Discussion/Conclusion:
The hypothesis was correct. Colder temperatures result in low rebound
height. {See data graph}. Each group of trials showed consistent results for each
temperature level. The results were consistent with the hypothesis {see Hypothesis Graph}.
Benefit to Community and/or Science:
The 'bouncy ball should never be used outside in the winter--the rebound height will be much
less than if it is used inside(winter) or outside(warm weather).
Background Research;
http://van.physics.illinois.edu/qa/listing.php?id=94, 'Q&A: Temperature affecting bouncy balls'
http://galileo.phys.virginia.edu/outreach/8thGradeSOL/EffectofTemperature.htm
Abstract:
The experiment was developed to find out if temperature would affect the rebound height of
'bouncy balls'. The hypothesis was that a frozen ball would have very little rebound height.
The balls used(3) were put in different temperature environments. A tape measure was attached
the the wall, 400cm high, and attached by duct tape at 1.5 M intervals.
For one week, one ball was stored in the freezer of the refrigerator in the classroom. One ball
was stored in the refrigerator, and one was stored in the classroom.
The scientist, standing at the top of the stairs, extended his arm, shoulder height, and dropped
the ball. The assistant recorded the rebound height for each ball, during each set of trials.